Temperature
Philodendron Selloums like to be warm so keep the temperature above 55 degrees during the winter.

Humidity
A Philodendron Selloum is a tree philodendron and has thinner leaves than many of its relatives, this is why it needs a more humid environment to flourish. If your house or office is very dry in the winter, place a Philodendron Selloum near a humidifier or on a wet pebble tray.

Flowering
It takes about 15-20 years for a Philodendron Selloum to flower and it rarely flowers indoors. The pedal-less flowers of a Philodendron Selloum are enclosed in a spathe, a modified leaf, which is often mistaken for the flower.

Diseases
Bacterial Blight is a plant disease that infects a Philodendron Selloum causing small very dark green blotches on leaves which expand rapidly. Infected leaves eventually rot and die, becoming quite smelly in the process. The best way to prevent this plant disease from infecting your Philodendron Selloum is to keep the leaves dry at all times, avoid overhead watering, and immediately remove any infected leaves.

Soil
A Philodendron Selloum grows best in a rich, slightly alkaline soil that retains moisture. The leaf tips of a Philodendron Selloum burn when there is too much salt in the soil usually due to over-feeding.

Pot Size
Re-pot a Philodendron Selloum when it becomes pot-bound. You can tell it’s time for a larger pot when the roots take on the shape of the existing pot. The new container for the Selloum should be 1″-2″ wider and deeper than the previous container.